configure: Remove OpenBSD workaround for curses probe

Remove the OpenBSD workaround for the curses probe. This has not been
necessary for 5 releases now.
Signed-off-by: NBrad Smith <brad@comstyle.com>
Signed-off-by: NAnthony Liguori <aliguori@us.ibm.com>

configure

@@ -1900,9 +1900,6 @@ if test "$curses" != "no" ; then
   curses_found=no
   cat > $TMPC << EOF
 #include <curses.h>
-#ifdef __OpenBSD__
-#define resize_term resizeterm
-#endif
 int main(void) {
   const char *s = curses_version();
   resize_term(0, 0);